This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / i386 / kernel / quirks-xen.c

diff --git a/arch/i386/kernel/quirks-xen.c b/arch/i386/kernel/quirks-xen.c
new file mode 100644 (file)
index 0000000..7e44d81
--- /dev/null
+++ b/arch/i386/kernel/quirks-xen.c
@@ -0,0 +1,48 @@
+/*
+ * This file contains work-arounds for x86 and x86_64 platform bugs.
+ */
+#include <linux/config.h>
+#include <linux/pci.h>
+#include <linux/irq.h>
+
+#if defined(CONFIG_X86_IO_APIC) && (defined(CONFIG_SMP) || defined(CONFIG_XEN)) && defined(CONFIG_PCI)
+
+static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
+{
+       u8 config, rev;
+       u32 word;
+
+       /* BIOS may enable hardware IRQ balancing for
+        * E7520/E7320/E7525(revision ID 0x9 and below)
+        * based platforms.
+        * Disable SW irqbalance/affinity on those platforms.
+        */
+       pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
+       if (rev > 0x9)
+               return;
+
+       printk(KERN_INFO "Intel E7520/7320/7525 detected.");
+
+       /* enable access to config space*/
+       pci_read_config_byte(dev, 0xf4, &config);
+       pci_write_config_byte(dev, 0xf4, config|0x2);
+
+       /* read xTPR register */
+       raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);
+
+       if (!(word & (1 << 13))) {
+               dom0_op_t op;
+               printk(KERN_INFO "Disabling irq balancing and affinity\n");
+               op.cmd = DOM0_PLATFORM_QUIRK;
+               op.u.platform_quirk.quirk_id = QUIRK_NOIRQBALANCING;
+               (void)HYPERVISOR_dom0_op(&op);
+       }
+
+       /* put back the original value for config space*/
+       if (!(config & 0x2))
+               pci_write_config_byte(dev, 0xf4, config);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_E7320_MCH,  quirk_intel_irqbalance);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_E7525_MCH,  quirk_intel_irqbalance);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_E7520_MCH,  quirk_intel_irqbalance);
+#endif